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both the blower and the seats are "heavy consumers" and as a result, if the system detect low power reserves, it will shut off those non-essential "heavy consumers" in effort to preserve the energy for vital systems... once the alternator tops off the battery, the systems come back to life... so, your system operates as designed...
however, you want to know why you have low power reserves... could be failing battery (even spanking brand new batteries off a shelf are known to have issues), could be failing alternator, could be battery not properly being charged as couple of years ago, when it was replaced, it was not coded to the vehicle for proper charginig levels...
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